Weinmann MEDUMAT Standard2 - Page 11

Pressure support and
the expiratory trigger
Pressure support ΔpASB
The pressure support is always given as a value above PEEP. In addition to the set
PEEP, a patient receives this as soon as the inspiration trigger has been detected.
Example calculation:
PEEP = 5mbar, ΔpASB = 10mbar inspiration pressure in the inhalation phase = 15mbar
Trigger level Corresponding unit value
Level 1 (long) Approx. 10% Flow max
Level 2 (medium) Approx. 35 % Flow max
Level 3 (Short) Approx. 70 % Flow max
Expiratory trigger
The expiratory trigger initiates expiration as soon as the ow to the patient is only
the set value (in %) with respect to the maximum ow. The length of the pressure
support is set with the expiratory trigger.
Trigger sensitivity: 5 % - 80 % of the maximum ow . In principle, the following applies:
the smaller the % value, the longer the pressure support lasts.
Pressure
PEEP
ΔpASB
Time
Time
Max. 4s
Flow
80% Flow
max
0%
100%
5%
5% Flow
max
Setting the levels of the expiratory trigger:
(If “3 levels” has been chosen as the trigger setting in the operator menu)